US7258350B2 - Chuck for receiving a rotary-percussion tool - Google Patents

Chuck for receiving a rotary-percussion tool Download PDF

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Publication number
US7258350B2
US7258350B2 US10/995,741 US99574104A US7258350B2 US 7258350 B2 US7258350 B2 US 7258350B2 US 99574104 A US99574104 A US 99574104A US 7258350 B2 US7258350 B2 US 7258350B2
Authority
US
United States
Prior art keywords
entraining
chuck
chuck according
radial dimension
grooves
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US10/995,741
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English (en)
Other versions
US20050110225A1 (en
Inventor
Werner Kleine
Werner Britten
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hilti AG
Original Assignee
Hilti AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
Assigned to HILTI AKTIENGESELLSCHAFT reassignment HILTI AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KLEINE, WERNER, BRITTEN, WERNER
Publication of US20050110225A1 publication Critical patent/US20050110225A1/en
Application granted granted Critical
Publication of US7258350B2 publication Critical patent/US7258350B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/08—Means for retaining and guiding the tool bit, e.g. chucks allowing axial oscillation of the tool bit
    • B25D17/084—Rotating chucks or sockets
    • B25D17/088—Rotating chucks or sockets with radial movable locking elements co-operating with bit shafts specially adapted therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/003—Details relating to chucks with radially movable locking elements
    • B25D2217/0034—Details of shank profiles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00—Chucks or sockets
    • Y10T279/17—Socket type
    • Y10T279/17042—Lost motion
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00—Chucks or sockets
    • Y10T279/17—Socket type
    • Y10T279/17042—Lost motion
    • Y10T279/17068—Rotary socket

Definitions

  • the present invention relates to a chuck for receiving a rotary/percussion tool such as a drill bit, chissel, or bore-crown cutter.
  • a chuck for receiving a shank of a rotary-percussion working tool e.g., such as disclosed in German Publication DE 3941 646 A1
  • the radially inwardly projecting entraining webs are subjected to high wear which substantially reduces the service life of the chuck.
  • a reduced wear of chucks is very important for their reliability, in particular, for those used in power tools used in mining for working concrete, mortar, and abrasive earth materials.
  • German Publication DE 38 43 465 A1 discloses a chuck with two entraining webs located radially inwardly with respect to guide surfaces, and with four, located radially outwardly with respect to the guide surfaces, entraining grooves which are axially offset relative to the entraining webs.
  • the entraining grooves have a central angle of 45°.
  • the inwardly located entraining webs are subjected to a strong wear which substantially reduces the chuck service life.
  • the remaining central angle of 45° between the grooves does not provide a sufficient guide space for the radially displaceable locking bodies which, therefore, are displaceable axially, which leads to an increased length of the chuck.
  • German Publications DE 196 04 283 A1 discloses a chuck having two entraining webs arranged radially inwardly with respect to the guide surfaces, and three, located radially outwardly with respect to the guide surfaces, entraining grooves symmetrically distributed over a circumference. With small entraining grooves having a central angle of less than 30, a suitable shank with small entrainable wings of less than 30 should be used.
  • an object of the present invention is a chuck having a reduced length and capable of transmitting high torques, without being subjected to a substantial wear.
  • a chuck for receiving a working tool rotable about a longitudinal axis and including a receiving sleeve open, with respect to its coaxial radial dimension, over its entire circumference and having a guide surface with the radial dimension and which extends along the longitudinal axis, and at least three, axially extending, up to a free end surface of the chuck, entraining grooves located in front of the guide surface of the chuck.
  • the entraining grooves are arranged radially outside of the radial dimension at angles of 0°, 120°, and 240° and each has a central angle defined with respect to the radial dimension and amounting to at least 40°.
  • the chuck further includes at least one locking member radially displaceable over the radial dimension and arranged circumferentially between two adjacent entraining grooves and diametrically opposite a third entraining groove.
  • a shank with entrainable wings having an adequate flexural strength and which are not subjected to a noticeable elastic/plastic deformation, can be used.
  • the central groove angle of the entraining grooves or of the associated entrainable wings permits to improve substantially the wear-determining parameters of the circumferentially oriented contact surfaces available for transmission of the torque. This statement will be supported by a discussion below based on scaling laws.
  • the highest torque peaks M occur during blocking of a tool at a radial outer edge of the tool.
  • the torque peaks M are proportional, at a predetermined hardness of a stone, to the radius of the tool or to a radial dimension R of the tool shank, so that M/R is constant.
  • both the radial dimension R and the contact surface of the associated entrainable wings at a predetermined length are proportional to the scaling factor and, therefore, the transmitted, at a linear load q, torque M is proportional to a square of the radial dimension R, whereby M ⁇ qR 2 .
  • the maximal linear load of the contact surface pressure depends only on the material pairing.
  • the wing is viewed approximately as a rectangular, radially projecting, loaded flexural beam having a wing thickness d ⁇ R and a wing height h ⁇ R.
  • the maximal allowable elastic/plastic deflection y ⁇ qh 4 /I ⁇ qR which remains constant.
  • each entraining groove which is expanded by a constant minimal gap dimension, optimally by of 0.8 mm, has a radial depth proportional to the radial dimension and amounting to from R/6 to R/3 and, optimally, being equal to R/4.5.
  • the wing height of the associated shank and which, together with the circumferentially oriented contact surface available for a torque transmission, is linearly correlated as an essential wear-determined parameter is set, with respect to the material pairing of chucks and axially impact-loaded tools, in an abrasive active environment, within tribologically suitable range.
  • each entraining groove with the above-mentioned depth has an axial length of at least 30 mm, so that the substantially wear-free transmittable, under Hertzian stress, torque, practically, is appropriately dimensioned.
  • a central angle of each entraining groove amounts maximum to 70°, whereby a sufficiently large central sleeve segment angle for guiding the radially displaceable locking member remains between two circumferentially adjacent entraining grooves.
  • This angle at a symmetrically equal distribution of the entraining grooves amounts minimum to 50°.
  • the central sleeve segment angle between two circumferentially adjacent grooves amounts to from 50° to 80°, whereby a stop web is formed at a radial dimension R for stopping the locking member which has, with respect to the axial cross-section, a circular shape, and which engages in a locking groove that is formed between two entrainable wings of the shank.
  • the locking member has a circular section that substantially fills the locking groove, and has a diameter that amounts to from 1.2R to 1.8R, and is advantageously equal to 1.4R.
  • the locking member has a shape of a roller and is oriented parallel to the chuck axis, whereby a high axial shear strength is achieved.
  • the guide inner surface has a machine-side guide end region arranged behind entraining grooves.
  • the guide end region has an inner, circumferentially closed, cylindrical surface.
  • the rear guide end region provides for transmission high bending torques to the associated, machine-side end of the guide surface of the shank.
  • the guide end region of the chuck has a length in a range from 1R to 3R, which is, advantageously, equal to 2R, whereby a seal can be provided within this length for preventing penetration of an abrasive dust in the chuck.
  • a seal a rubber lip seal can be used.
  • FIG. 1 a longitudinal, partially cross-sectional view of a chuck according to the present invention
  • FIG. 2 a cross-sectional view along line II-II of the chuck shown in FIG. 1 ;
  • FIG. 3 a cross-sectional view similar to that of FIG. 2 of another embodiment of a chuck according to the present invention.
  • a chuck 1 according to the present invention which is shown in FIG. 1 , is designed for receiving a rotary-percussion tool 2 rotable about a longitudinal axis A.
  • the chuck 1 has a receiving sleeve 3 having a radial dimension or radius R of the opening formed thereby.
  • the receiving sleeve 3 has an inner guide surface 12 extending along the axis A and having the same radial dimension R along its entire longitudinal extent.
  • An axially extending entraining groove 5 which is provided in the receiving sleeve 3 , adjoins the machine-tool or power tool side, guide end region 13 .
  • the entraining groove 5 is open at a free end surface 4 of the chuck 1 .
  • the entraining groove 5 has an axial length L of 40 mm.
  • a roller-shaped, radially displaceable, locking member 6 oriented parallel to the axis A.
  • the locking member 6 is diametrically arranged with respect to the entraining groove 5 and extends both within and outside of the radial dimension R in the locking position shown in the drawing.
  • the machine-tool-or power tool-side, guide end region 13 which is located behind the entraining groove 5 , has a circumferentially closed, inner cylindrical surface with a guide length F of 2R.
  • sealing means 10 in form of a rubber seal lip.
  • the chuck 1 has three inner entraining grooves 5 which extend radially, rotationally symmetrically outside of the radial dimension R at angles of 0°, 120°, and 240°, and a single locking member 6 displaceable radially within the radial dimension R.
  • the locking member 6 is located between two adjacent groove 5 and diametrically opposite the third groove 5 .
  • a central groove angle ( ⁇ ), which is defined with respect to the radial dimension R, amounts to 45°.
  • a respective remaining central angle ⁇ of a sleeve segment for guiding the radially displaceable, locking member 6 amounts to 75°.
  • Each entraining groove 5 has a radial depth H, with the ratio of the depth H to the radial dimension R amounting substantially to 1/4.5.
  • the radial depth H encompasses a minimal gap dimension S of 0.8 mm.
  • the roll-shaped locking member 6 having a diameter D of 1.4R abuts, in its radially inner locking position, a stop web 11 that extends up to the radial dimension R, with its locking circular section filling an associated locking groove 7 between two wings 8 of a shank 9 of a working tool 2 .
  • Each of the locking member 6 has its locking circular section received in a respective locking groove 7 of the shank 9 . Because the shank 9 has an outer diameter corresponding to the radial dimension R, it does not extend into the entraining grooves 5 which, thereby, remain free. In this embodiment, the rotation of the tool 2 is insured only by the locking members 6 which engage in the respective locking grooves 7 of the shank 9 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Jigs For Machine Tools (AREA)
  • Drilling Tools (AREA)
US10/995,741 2003-11-26 2004-11-22 Chuck for receiving a rotary-percussion tool Expired - Fee Related US7258350B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10355376.2 2003-11-26
DE10355376 2003-11-26

Publications (2)

Publication Number Publication Date
US20050110225A1 US20050110225A1 (en) 2005-05-26
US7258350B2 true US7258350B2 (en) 2007-08-21

Family

ID=34442306

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/995,741 Expired - Fee Related US7258350B2 (en) 2003-11-26 2004-11-22 Chuck for receiving a rotary-percussion tool

Country Status (6)

Country Link
US (1) US7258350B2 (ja)
EP (1) EP1535704B1 (ja)
JP (1) JP4758637B2 (ja)
CN (1) CN100418706C (ja)
AT (1) ATE460255T1 (ja)
DE (1) DE502004010872D1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060103082A1 (en) * 2004-11-12 2006-05-18 Werner Kleine Chuck

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006000168A1 (de) * 2006-04-10 2008-01-03 Hilti Ag Werkzeugaufnahme
DE102007048822A1 (de) * 2007-10-10 2009-04-16 Robert Bosch Gmbh Elektrische Kombi-Handwerkzeugmaschine
WO2014103031A1 (ja) 2012-12-28 2014-07-03 大昭和精機株式会社 工具保持構造
CN104149074B (zh) * 2013-05-13 2016-12-28 宝时得机械（张家港）有限公司 夹头
CN109604657B (zh) * 2019-01-11 2020-06-09 亚普汽车部件股份有限公司 中空体夹具
US11945087B2 (en) * 2019-03-29 2024-04-02 Tien-I Industrial Co., Ltd. Impact tool head
CN112443959B (zh) * 2019-08-29 2024-04-30 法雷奥汽车空调湖北有限公司 供暖通风空调（hvac）壳体

Citations (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE206164C (ja)
US2468874A (en) * 1946-11-07 1949-05-03 Karl G R Hawkins Torsion driven tool
US3982846A (en) * 1973-12-05 1976-09-28 Steinbach Ralph L Tool device
US4106573A (en) * 1976-09-13 1978-08-15 Joy Manufacturing Company Drill
US4131165A (en) * 1976-04-28 1978-12-26 Robert Bosch Gmbh Hammer drill
DE8433275U1 (de) 1984-11-14 1986-03-27 Hawera Probst Gmbh + Co, 7980 Ravensburg Bohrwerkzeug
US4619460A (en) * 1983-03-25 1986-10-28 Roehm Guenter H Hammer-drill chuck
US4627626A (en) * 1984-05-08 1986-12-09 Roehm Guenter H Chuck for a hammer or rotary impact drill
US4655651A (en) * 1984-08-09 1987-04-07 Hilti Aktiengesellschaft Drill bit for hand-held drilling machines
US4690226A (en) * 1983-09-03 1987-09-01 Metabowerke Gmbh & Co. Hammer drill
US4752165A (en) * 1983-12-09 1988-06-21 Robert Bosch Gmbh Arrangement for torque transmitting, and tool cooperating therewith
US4840519A (en) * 1983-12-27 1989-06-20 Gebruder Heller Gmbh. Werkzeugfabrik Drill bit for hand drills
DE3843465A1 (de) * 1988-12-23 1990-06-28 Bosch Gmbh Robert Einrichtung zum spannen von werkzeugen
DE3941646A1 (de) 1989-12-16 1991-06-20 Heller Werkzeug Gmbh Geb Werkzeug zum schlagbohren und werkzeugaufnahme fuer schlagbohrende werkzeuge
US5286145A (en) * 1991-11-12 1994-02-15 Hilti Aktiengesellschaft Tool bit and tool bit chuck for percussion drilling
EP0584706A2 (de) 1992-08-22 1994-03-02 Robert Bosch Gmbh Werkzeug für Handwerkzeugmaschinen
US5320459A (en) * 1992-01-13 1994-06-14 Hilti Aktiengesellschaft Tool bit for percussion drilling and chipping and chuck for the tool bit
US5326199A (en) * 1992-07-17 1994-07-05 Hilti Aktiengesellschaft Tool bit and tool bit chuck for manually operated tools
US5340245A (en) * 1990-10-16 1994-08-23 Robert Bosch Gmbh Device on portable machine tools
US5427481A (en) * 1993-03-06 1995-06-27 Hilti Aktiengesellschaft Tool bit and tool bit chuck for hand tools
DE19604283A1 (de) 1996-02-07 1997-08-14 Bosch Gmbh Robert Einsatzsystem für Maschinen mit Bohr- und/oder Schlagbetrieb
US5700018A (en) * 1995-10-09 1997-12-23 Hilti Aktiengesellschaft Tool bit chuck
US5706903A (en) * 1991-09-26 1998-01-13 Robert Bosch Gmbh Tool
US5785448A (en) 1996-05-02 1998-07-28 Lemforder Nacam Device for coupling two shafts
US5807040A (en) * 1995-10-09 1998-09-15 Hilti Aktiengesellschaft Tool bit chuck
US5984596A (en) * 1995-10-12 1999-11-16 Robert Bosch Gmbh Insertable tool and tool holder for drilling and/or impacting electric machines
US6059296A (en) * 1998-05-13 2000-05-09 Otto Bilz, Werkzeugfabrik Gmbh & Co. Chuck for rotatable tools, in particular drills, screw taps, etc.
US6261035B1 (en) 1998-11-12 2001-07-17 Black & Decker Inc. Chuck, bit, assembly thereof and methods of mounting
US6390739B1 (en) 1999-07-21 2002-05-21 Black & Decker Inc. Power drivable chuck
US6474656B1 (en) 1999-07-21 2002-11-05 Black & Decker Inc. Power drivable chuck
US6543558B1 (en) * 1999-10-29 2003-04-08 Hilti Aktiengesellschaft Drilling and/or chiseling tool
US6588993B2 (en) * 2000-06-30 2003-07-08 Omi Kogyo Co., Ltd. Cutting tool, tool holder and tool assembly

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DE2551125A1 (de) * 1975-11-14 1977-05-26 Bosch Gmbh Robert Einrichtung zur drehmomentuebertragung
DE3714679A1 (de) * 1985-11-11 1988-11-10 Hilti Ag Werkzeughalter
DE4341969A1 (de) * 1993-12-09 1995-06-14 Hilti Ag Werkzeug und Werkzeugaufnahme für Handwerkzeuggeräte
DE4403303A1 (de) * 1994-02-03 1995-08-10 Hilti Ag Werkzeug und Werkzeugaufnahme für Handwerkzeuggeräte
DE19516034A1 (de) * 1995-05-04 1996-11-07 Hilti Ag Einrichtung zur Drehmomentübertragung bei Handwerkzeuggeräten
DE10206164B4 (de) * 2002-02-15 2005-06-09 Weißenbach, Ulrich Einspannschaft
DE10338640A1 (de) * 2003-08-22 2005-03-17 Hilti Ag Einsteckende für ein drehendes und schlagendes Werkzeug

Patent Citations (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE206164C (ja)
US2468874A (en) * 1946-11-07 1949-05-03 Karl G R Hawkins Torsion driven tool
US3982846A (en) * 1973-12-05 1976-09-28 Steinbach Ralph L Tool device
US4131165A (en) * 1976-04-28 1978-12-26 Robert Bosch Gmbh Hammer drill
US4106573A (en) * 1976-09-13 1978-08-15 Joy Manufacturing Company Drill
US4619460A (en) * 1983-03-25 1986-10-28 Roehm Guenter H Hammer-drill chuck
US4690226A (en) * 1983-09-03 1987-09-01 Metabowerke Gmbh & Co. Hammer drill
US4752165A (en) * 1983-12-09 1988-06-21 Robert Bosch Gmbh Arrangement for torque transmitting, and tool cooperating therewith
US4840519A (en) * 1983-12-27 1989-06-20 Gebruder Heller Gmbh. Werkzeugfabrik Drill bit for hand drills
US4627626A (en) * 1984-05-08 1986-12-09 Roehm Guenter H Chuck for a hammer or rotary impact drill
US4655651A (en) * 1984-08-09 1987-04-07 Hilti Aktiengesellschaft Drill bit for hand-held drilling machines
DE8433275U1 (de) 1984-11-14 1986-03-27 Hawera Probst Gmbh + Co, 7980 Ravensburg Bohrwerkzeug
DE3843465A1 (de) * 1988-12-23 1990-06-28 Bosch Gmbh Robert Einrichtung zum spannen von werkzeugen
DE3941646A1 (de) 1989-12-16 1991-06-20 Heller Werkzeug Gmbh Geb Werkzeug zum schlagbohren und werkzeugaufnahme fuer schlagbohrende werkzeuge
US5340245A (en) * 1990-10-16 1994-08-23 Robert Bosch Gmbh Device on portable machine tools
US5706903A (en) * 1991-09-26 1998-01-13 Robert Bosch Gmbh Tool
US5286145A (en) * 1991-11-12 1994-02-15 Hilti Aktiengesellschaft Tool bit and tool bit chuck for percussion drilling
US5320459A (en) * 1992-01-13 1994-06-14 Hilti Aktiengesellschaft Tool bit for percussion drilling and chipping and chuck for the tool bit
US5326199A (en) * 1992-07-17 1994-07-05 Hilti Aktiengesellschaft Tool bit and tool bit chuck for manually operated tools
EP0584706A2 (de) 1992-08-22 1994-03-02 Robert Bosch Gmbh Werkzeug für Handwerkzeugmaschinen
US5427481A (en) * 1993-03-06 1995-06-27 Hilti Aktiengesellschaft Tool bit and tool bit chuck for hand tools
US5807040A (en) * 1995-10-09 1998-09-15 Hilti Aktiengesellschaft Tool bit chuck
US5700018A (en) * 1995-10-09 1997-12-23 Hilti Aktiengesellschaft Tool bit chuck
US5984596A (en) * 1995-10-12 1999-11-16 Robert Bosch Gmbh Insertable tool and tool holder for drilling and/or impacting electric machines
DE19604283A1 (de) 1996-02-07 1997-08-14 Bosch Gmbh Robert Einsatzsystem für Maschinen mit Bohr- und/oder Schlagbetrieb
US5785448A (en) 1996-05-02 1998-07-28 Lemforder Nacam Device for coupling two shafts
US6059296A (en) * 1998-05-13 2000-05-09 Otto Bilz, Werkzeugfabrik Gmbh & Co. Chuck for rotatable tools, in particular drills, screw taps, etc.
US6261035B1 (en) 1998-11-12 2001-07-17 Black & Decker Inc. Chuck, bit, assembly thereof and methods of mounting
US6390739B1 (en) 1999-07-21 2002-05-21 Black & Decker Inc. Power drivable chuck
US6474656B1 (en) 1999-07-21 2002-11-05 Black & Decker Inc. Power drivable chuck
US6543558B1 (en) * 1999-10-29 2003-04-08 Hilti Aktiengesellschaft Drilling and/or chiseling tool
US6588993B2 (en) * 2000-06-30 2003-07-08 Omi Kogyo Co., Ltd. Cutting tool, tool holder and tool assembly

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060103082A1 (en) * 2004-11-12 2006-05-18 Werner Kleine Chuck
US8066290B2 (en) * 2004-11-12 2011-11-29 Hilti Aktiengesellschaft Chuck

Also Published As

Publication number Publication date
JP4758637B2 (ja) 2011-08-31
DE502004010872D1 (de) 2010-04-22
ATE460255T1 (de) 2010-03-15
EP1535704B1 (de) 2010-03-10
US20050110225A1 (en) 2005-05-26
EP1535704A1 (de) 2005-06-01
CN1644325A (zh) 2005-07-27
JP2005153139A (ja) 2005-06-16
CN100418706C (zh) 2008-09-17

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Owner name: HILTI AKTIENGESELLSCHAFT, LIECHTENSTEIN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KLEINE, WERNER;BRITTEN, WERNER;REEL/FRAME:016027/0405;SIGNING DATES FROM 20041115 TO 20041117

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Effective date: 20150821